[DeTomaso] [SPAM] Wheel bearing issues

[Tomas Gunnarsson]

 Fred, I thought we were talking about front wheel bearings as installed on the Pantera. My point is that installing them preloaded might result in excessive preload due to temp differences. Tomas > Från: F&D Terry > Till: Tomas Gunnarsson > Rubrik: Re: [DeTomaso] [SPAM] Wheel bearing issues > Datum: Wed, 03 Oct 2007 18:44:33 -0400 > Thomas, > > I don't see any exceptional differences. Both the Corvette and modified > Pantera upright employ a pair of taper bearings to mount an axle in a > housing with a brake disc on one end and a u-joint on the other. I guess > either preloaded or bearings with slight end play will both work. > > Fred T. > > Tomas Gunnarsson wrote: > > >Is it possible that the application we're talking about is exceptional > compared to other applications? In our case heat from braking will spread > from rotor to hub long before the spindle axle is hot. This might decrease > play or increase preload in a somewhat unpredictable way. > > > >Tomas > > > >----- Original Message ----- > >From: "F&D Terry" > >To: > >Cc: ; ; > >Sent: Wednesday, October 03, 2007 8:55 PM > >Subject: Re: [DeTomaso] [SPAM] Wheel bearing issues > > > > > > > > > >>Dick, > >> > >>There seems to be two acceptable schools of thought concerning preload. > >>The Corvette shop manuals for '63 forward specify a .001" to .007" free > >>play to be within acceptable limits for the taper bearing rear uprights. > >>>From a '63 shop manual, "The tapered roller spindle bearings should have > > >>end play of .001"-.007". Check end play and, when necessary, adjust as > >>follows." I have owned many of these cars and have never had problems. > >> > >>Fred T. > >> > >>Dick Koch wrote: > >> > >> > >> > >>>This interesting (to some) topic comes up every now and then. For those > > >>>with an interest in going through the "whats, hows, and whys" of > >>>bearings, visit the Timken automotive tech site at: > >>> > >>><<a target="_blank" > href=http://www.timken.com/products/bearings/techtips.asp>>http://www.timken > .com/products/bearings/techtips.asp>>>> > >>>All the issues discussed on this thread (bearings, seals, lubricant, > >>>etc.) are covered. > >>> > >>>For a primer on bearings, Tech Tips "Volume 1" gives a quick overview of > > >>>bearing topics. > >>> > >>>For additional information, click on the "here" link at the bottom of > >>>the page for additional automotive tech tips. > >>> > >>>As a side item, it is interesting to note that the technique of > >>>"preloading" a tapered roller bearing, as referenced by Timken, is > >>>preferable to the "end play" adjustment technique (see "Issue 3, Tech > >>>Tips Volume 6). > >>> > >>>"..... (a) slight preload can be beneficial to the success of long wheel > > >>>end life. Slight preload can improve bearing, seal and tire life, but > >>>only if the entire process is in control. "In control" means that you > >>>actually know the bearing setting process will result in a consistent > >>>bearing setting range." > >>> > >>>However, that topic on preloading specifically speaks to the pitfalls of > > >>>incorrectly preloading a bearing. > >>> > >>>"The benefits of a light and controlled preload bearing setting are > >>>negated if bearing preload force is excessive. Excessive preload can > >>>cause high > >>>operating temperatures, reduced lubricant life, reduced seal life, and > >>>premature bearing damage. Bearing lock-up and/or wheel end separation > >>>may occur if the preload force is excessive." > >>> > >>>Since it takes a skilled tech, spending the time necessary to set a > >>>correct preload, Timken recommends in the automotive tech section to use > > >>>the "end play" bearing adjustment procedure used by the majority of > >>>mechanics. As per Timken, "This method requires the least skill and has > > >>>proven to be the overall best technique for general field installation > >>>and maintenance." > >>> > >>>Dick Koch - Atlanta > >>> > >>>MikeLDrew at aol.com wrote: > >>> > >>> > >>> > >>> > >>>>In a message dated 10/2/07 20 42 44, pantera at pobox.com writes: > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>>>What seems to have gone wrong with mikes car is a lack of lube. I > dont see > >>>>>ANY! > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>Yeah, me neither. Trust me, it was there at one point, not too long > ago. > >>>>What you couldn't see in the close-up photos was that there was grease > residue > >>>>all over the surface of the hub. The grease seemed to transform to > oil as > >>>>the heat built up, and then all leaked out, apparently? > >>>> > >>>>I got both spindles off today (passenger side seems fine), and will > shortly > >>>>dismantle them both. I aim to see if the passenger side is adequately > > >>>>lubricated or not. > >>>> > >>>>Lessons have been learned, no doubt! > >>>> > >>>>Mike > >>>> > >>>> > >>>>************************************** > >>>>See what's new at > >>>> href=http://www.aol.com>http://www.aol.com>>>>__________________________ > _____________________ > >>>> > >>>>Detomaso Forum Managed by POCA > >>>> > >>>>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > >> > >>>>DeTomaso mailing list > >>>>DeTomaso at list.realbig.com > >>>> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>_______________________________________________ > >>> > >>>Detomaso Forum Managed by POCA > >>> > >>>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > > > >>>DeTomaso mailing list > >>>DeTomaso at list.realbig.com > >>> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >>_______________________________________________ > >> > >>Detomaso Forum Managed by POCA > >> > >>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > > >>DeTomaso mailing list > >>DeTomaso at list.realbig.com > >> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>> > >> > >> > >_______________________________________________ > > > >Detomaso Forum Managed by POCA > > > >Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/> > >DeTomaso mailing list > >DeTomaso at list.realbig.com > > href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso> > > > > > > > > > > > > : > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>>>What seems to have gone wrong with mikes car is a lack of lube. I > dont see > >>>>>ANY! > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>Yeah, me neither. Trust me, it was there at one point, not too long > ago. > >>>>What you couldn't see in the close-up photos was that there was grease > residue > >>>>all over the surface of the hub. The grease seemed to transform to > oil as > >>>>the heat built up, and then all leaked out, apparently? > >>>> > >>>>I got both spindles off today (passenger side seems fine), and will > shortly > >>>>dismantle them both. I aim to see if the passenger side is adequately > > >>>>lubricated or not. > >>>> > >>>>Lessons have been learned, no doubt! > >>>> > >>>>Mike > >>>> > >>>> > >>>>************************************** > >>>>See what's new at > >>>> href=http://www.aol.com>http://www.aol.com>>>>__________________________ > _____________________ > >>>> > >>>>Detomaso Forum Managed by POCA > >>>> > >>>>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > >> > >>>>DeTomaso mailing list > >>>>DeTomaso at list.realbig.com > >>>> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>_______________________________________________ > >>> > >>>Detomaso Forum Managed by POCA > >>> > >>>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > > > >>>DeTomaso mailing list > >>>DeTomaso at list.realbig.com > >>> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >>_______________________________________________ > >> > >>Detomaso Forum Managed by POCA > >> > >>Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/>> > > >>DeTomaso mailing list > >>DeTomaso at list.realbig.com > >> href=http://list.realbig.com/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso>> > >> > >> > >_______________________________________________ > > > >Detomaso Forum Managed by POCA > > > >Archive Search Engine Now Available at href=http://www.realbig.com/detomaso/>http://www.realbig.com/detomaso/> > >DeTomaso mailing list > >DeTomaso at list.realbig.com > > href=http://list.realbigcom/mailman/listinfo/detomaso>http://list.realbig.c > om/mailman/listinfo/detomaso


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